IPA: /dɪˈmɪn.ə.rəˌlaɪzd/
KK: /dɪˈmɪn.ə.rə.laɪzd/
Describing something that has had all its minerals taken away or removed.
The water was demineralized to make it safer for drinking.
Demineralized → It is formed from "de-" (meaning down or away) and "mineral" (from Latin "mineralis", meaning pertaining to minerals) and the suffix "-ized" (meaning to make or to become). The word "demineralized" means to remove minerals from something, effectively making it devoid of minerals.
Think of 'removing' ('de-') 'minerals' from something — that's what dematerialized means.